Dear Dr. Zimmerman, I read the manual but I didn't understand how Pmin mu and Pmin for dispatchable loads as well as Pmax for generators are calculated. The value of Pmin is different with the value set in the case file.I really confused. If it is possible please explain, because It is not clear for me how it has been computed.
Best Regards Carol Francesca On Mon, Mar 26, 2012 at 15:16, Ray Zimmerman <r...@cornell.edu> wrote: > MU_PMIN and MU_QMIN are shadow prices on the minimum generation limits for > real and reactive power. Constraint shadow prices, also called Kuhn-Tucker > multipliers, are a standard output of most all constrained optimization > solvers. See any book on constrained optimization for a description of > their meaning and how they are computed for any given algorithm. > > In MATPOWER, the shadow prices are computed by whichever solver is used. > For example, in the case of the default MIPS solver, they are included in > the mu variable in equation (A.32) in Appendix A. The value is computed in > mips.m. > > I should probably mention also that in the case of trapezoidal generator > capability curves (see Section 5.4.3 in the manual), if one of the sloped > portions of the curve is binding, its shadow price is decomposed into > components for the corresponding real and reactive limits. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Mar 25, 2012, at 7:08 PM, Carol Francesca wrote: > > Dear Prof. Zimmerman, > > I have a question: > > When I do runmarkt sometimes price and Lambdas are not equal and its > because of network congestion and losses. > In MATPOWER, how MU_PMIN and MU_QMIN are calculated? Could you please > address the m.file which calculates these? > How they affect the prices? There is no sufficient explanation about it in > the manual. I am sorry but I cannot understand how they are calculated. > > Best Regards > > Carol > > >
